Revolving chair.



MIOIIAEL EVEN, OF PORT WASHINGTON, WISCONSIN.

REVO LVING CHAIR.

SPECIFICATION' forming part of Letters Patent No. 638,223, datedDecember 5, 1899.

Application fled .Tuly 5, 1899. `Serial No. 722,809. (No model.)

To all whom it may con/cern:

Be it known that I, MICHAEL EVEN, a citizen of the United States,residing at Port Washington, in the county of Ozaukee and State ofWisconsin, have invented certain new and useful Improvements inRevolving Chairs,of which the following is a specification, referencebeing had to the accompanying drawings, forming a part thereof.

My invention relates to that class of revolving chairs in which thechair-seat is adj ustable vertically with respect to the base andadapted to turn Without affecting its vertical adjustment.

The main object of this invention is to simplify and improve theconstruction and operation of devices of this class.

It consists in a novel construction and organization of partshereinafter particularly described, and pointed out in the claims.

In the accompanying drawings like letters designate the same parts inthe several figures.

Figure l is a vertical section on the line l l, Fig. 4, of chair-ironsembodying my improvements. Fig. 2 is an enlarged horizontal section onthe line 4 4., Fig. 1. Fig. 3 is an enlarged side elevation and verticalsection on the line 5 5, Fig. 2, of a part of the spindle and of theswiveling sleeve; and Figs. 4t and 5 are views of a modifiedconstruction of the swiveling sleeve, Fig. 4 being a partial sideelevation and partial vertical section on the line 6 6, Fig. 5, and Fig.5 a plan view.

A is a tubular hub constituting a part of a chair-base, the legs beingattached thereto in the usual or any suitable way. For the attachment ofthe legs I have shown in Fig. l a flange a formed on the upper end ofthe hub and having an annular groove in its under face, a ring A fittedon the lower end of the hub and having a similar groove in its upperface, and a nut a threaded on said hub for adjustably holding the ringA'in place.

B is a screw-threaded spindle adapted to carry the chair-seat. It isgrooved or 'flattened on one side, as shown most clearly in Fig. 2, toform a longitudinal keyway.

C is a sleeve fitted to turn freely in the hub A and secured therein byan outwardly-projecting ange c, formed on its upper ond,

and a severed ring c, sprung into an eXternal groove at or near itslower end, which eX- tends below an internal shoulderin said hub.

i The smaller portions of the bore of this sleeve cilitate roaming thebore of said sleeve, the

key b is formed in a ring b', which is 4fitted in the upper enlarged endof the bore of said sleeve and is held from turning therein byprojections on the outer side of said ring engaging with correspondingrecesses in the bore ofthe sleeeve, as shown in Fig. 2. When the sleeveis reamed, this ring is removed, so that the reamer may project throughthe upper end of the sleeve. The keyh may, however, be cast with thesleeve, as shown in Figs. 4 and 5, and the reamer may be insertedthrough the lower end of the sleeve and advanced therein as farvas thekey, the bore of the sleeve at its upper end adjacent to the key beingformed by a core of sufficient size so that it Will require no reamingor finishing to tit or clear the spindle.

D is a nut adapted to fit the thread on the spindle and preferablyformed with a hand- Wheel to facilitate the adjustment of the spindle upand down in the sleeve O. It is formed or provided on the under side andon opposite sides of its bore with two inturned lugs d d, which areadapted to be carried transversely to the bore of the sleeve O intoengagemen't with an annular flange c2 on its upper end, and thus holdthe parts together in proper relation to each other when the spindle isinserted through the nut into the sleeve and also prevent removal of thechairseat from the base when the chair is lifted. An annular groove orball-race is formed in the under side of the iange c, and acorresponding groove is formed in the upper end of the hub A, and ballsE are insertedin said grooves to facilitate the turning of the sleeve Oin said hub. I

It will be seen from the drawings and the foregoing description thatwhen the spindle B is turned in the ordinary use of the chair IOO thesleeve C and the nut I) will be turned with it without affecting thevertical adjustment of said spindle and that by turning the nut whilethe chair-seat is held against rotation the spindle will be raised orlowered in the sleeve C and hub A of the Chair-base, said sleeve beingheld from turningwith the nut D by the key l) engaging the keyway insaid spindle. By screwing the spindle up till its lower end will clearthe upper end of the sleeve C it maybe removed with the nut from thechair-base by carrying it to one side sufficiently to disengage the lugscl from the fiange c2, and by the reverse of these operations the partsmay be easily assembled, care being taken to hold the keyway directlyopposite the key?) as the spindle B is entered into the sleeve C.

F is a head mounted on the upper end of the spindle B.

Gis a frame or spider to which the chairseat is attached. Itispreferably pivotedto the head F by a bolt or pin g passing transverselythrough npturned arms fon said head and depending ears g on said frame,as shown in Fig. l, or in any other suitable manner, so as to permit thechair-seat to tilt backward.

Various modifications in the details of the device may be made withoutdeparting from the principle and intended scope of my in vention.

I claiml. The combination with ahub constituting a part of a chair-base,and a screw-threaded spindle adapted to carry a chair-seat and having alongitudinal keyway, of a sleeve secured and adapted to turn freely inthe bore of said hub and provided with an annular flange or shoulder onits upper end and with a key or projection arranged to 'engage with saidkeyway and prevent the spindle from turning in-said sleeve, and a nutengaging the thread on said spindle and provided with a lug engaging theannular liange or shoulder on said sleeve, substantially as and for thepurposes set forth.

2. The combination with a hub constituting a part of a chair-base, and ascrew-threaded spindle adapted to carry a chair-seat, of a sleeve ttedand adapted to turn in the bore of said hub and provided with anoutwardlyprojecting ball hearing and with an outwardly-projecting flangeor shoulder at its upper end, balls interposed between said hearing andthe upper end of said hub, and a nut engaging the thread on said spindleand bearing on the upper end of said sleeve in revoluble engagement withthe fiange or shoulder thereon, substantiallyas and for the purposes setforth.

3. The combination with ahub constituting a part of a chair-base, and ascrew-thread ed spindle adapted to carry a chair seat and formed with alongitudinal keyway, of a sleeve fitted to turn in the bore of saidhuband to receive said spindle which is adjustable endwise therein withoutturning, a key adapted to engage the keyway of said spindle and formedwith a ring which is held in 'an enlargement of the bore of said sleeve,and

a nut adapted to engage the screw-thread on said spindle and to bear onthe upper end of said sleeve, substantially as and for the purposes setforth.

4. The combination with the huh ofa chairbase and a screwth1-eadedspindle adapted to carry a chair-seat, of a sleeve fitted to turn in thebore of said hub'and provided at its upper end. with an annular fiange,means for retaining said sleeve in said hub, means for preventing thespindle from turning in said sleeve, and a nut threaded to engage withthe thread of said spindle and provided with inturned lugs adapted toengage with said flange on opposite sides of the spindle, substantiallyas and for the purposes set forth.

In witness whereof I hereto affix my signature in presence of twoWitnesses.

MICHAEL EVEN.

Witnesses:

(JHAs. L. Goss, KENT H. FLANDERs.

